Xcode 13.2 Beta: Can only own code use the async/await in macos < 12.0

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Fribi OP

Created Oct ’21

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With Xcode 13.2 it is now possible to use async/await also in code prior to macos 12.0 (iOS....).

As I like this new pattern i have started to migrate existing code to this pattern and I have found out, that although you can use async/await in your own code, you cannot (yet?) call system libraries that adopt this pattern.

I have for example tried to replace URLSessions dataTask(with:completionHandler:) with the async version data(from, delegate) async throws -> (Data, URLResponse) but this fails with the error, that this function is only available on macos 12.0.

Am I missing something or is Apple planning to also add backward compatibility for older OS versions? Like this it is just half that funny.

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Answer 1

knshi OP

Oct ’21

Hope this helps:

https://www.swiftbysundell.com/articles/connecting-async-await-with-other-swift-code/

You can use concurrency prior to macOS 12.0 because it is a language feature, but not the macOS 12's frameworks (macOS feature). If you want to mix code of <12.0 and >12.0, you can use the example of that article to build your own function constructor.

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Answer 2

Fribi OP

Oct ’21

Hi,

thanks for your answer.

Of course it is an idea to just use withCheckedThrowingContinuation(function:_:) to introduce my own async functions to existing functions with completions, but it just seems odd, that Apple just does not supply them out of the box. Maybe another beta will.

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